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Math
Geometry
Ch 1 Tools of Geometry
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Gravity
Geometry 2012 edition Pearson 2013-2014
Terms in this set (38)
point
indicates a location and has no size
line
represents a straight path that extends in two opposite directions without end and has no thickness; contains infinitely many points
plane
a flat surface that extends without end and has no thickness; contains infinitely many lines
collinear points
points on the same line
coplanar
points and/or figures in the same plane
space
the set of all points
segment
the part of a line that consists of two points, called endpoints, and all points between them
ray
the part of a line that consists of one endpoint and all the points of the line on one side of the endpoint
opposite rays
two rays with the same endpoint; they form a line
postulate (axiom)
an accepted statement of fact
intersection
the set of points that two or more geometric figures have in common
coordinate
the real number that corresponds to a point
distance
the absolute value of the difference between the coordinates of 2 points on a line
congruent segments
segments that have the same length
midpoint
the point that divides a segment into two congruent segments
segment bisector
a line, segment, ray, or plane that intersects a segment at its midpoint
angle
figure that is formed by two rays with the same endpoint.
sides of an angle
the two rays that form the angle
vertex of an angle
the common endpoint of the rays that form the sides of an angle
measure of an angle
the absolute value of the difference of the real numbers crossed by each ray of the angle
acute angle
an angle whose measure is between 0° and 90°
right angle
an angle whose measure is exactly 90°
obtuse angle
an angle whose measure is between 90° and 180°
straight angle
an angle whose measure is 180°
congruent angles
angles that have the same measure
adjacent angles
two coplanar angles with a common side, common vertex and no common interior points
vertical angles
two congruent angles formed by the intersection of 2 lines whose sides are opposite rays
complementary angles
two angles whose measures have a sum of 90°
supplementary angles
two angles whose measures have a sum of 180°
linear pair
a pair of adjacent angles whose noncommon sides are opposite rays
angle bisector
a ray that divides an angle into two congruent angles
straightedge
a ruler with no markings on it
compass
a geometric tool used to draw circles and and parts of circles called arcs
construction
a geometric figure drawn using a straightedge and a compass
perpendicular lines
two lines that intersect to form right angles
perpendicular bisector
a line, segment, or ray that is perpendicular to the segment at its midpoint
perimeter
the sum of the lengths of the sides
area
the number of square units enclosed by the figure
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